Microscope.



No. 663,649. Patented Dec. Il, |900. H. ZIRNGIBL.

MICROSGOPE.

Application led June 14, 1900.

UNITED STATESv PATENT trice.

HERMANN ZIRNGIBL, OF BUFFALO, NEW YORK, ASSIGNOR TO THE SPENCER LENS COMPANY, OF SAME PLACE,

MLGROSGOPE.

SECIFICATION forming part of Letters Patent N o. 663.649, dated December 11, 1900.

Application iiled June lll, 1900. Serial No. 20,280. (No model.)

To all whom t may concern,.- provided with my improvements. Fig. 2 is Be it known that I, HERMANN ZIRNGIBL, a a det-ached longitudinal section, on an encitizen of the United States, and a resident larged scale, of the lower portion of the pilof Buffalo, in the county of Erie and State lar, the sleeve of the line adjustment, and the 55 5 of New York, have invented a new and usedust-guard, `the plane oi' the section beingin ful Improvement in Microscopes,of which the line 2 2, Fig. il. Fig. 3 is a transverse secfollowing is a specification. tion in line 3 3, Fig. 2, looking upward. Eig.

This invention relates to microscopes and a is a transverse section in line 4 4E, Fig. 2. similar instruments in which the lens-tube is Fig. 5 is a detached sectional elevation, on 6o 1o carried by a vertically-movable sleeve,which an enlarged scale, of the main stage and the is raised and lowered on the usual pillar by substage comprising the upper and lower irisan adjusting device commonly known as the diaphragme, the condenser, and its holder, iineadjustnient Heretoforetheconstruc showing the position of the parts when the tion of these instruments has been such that condenser is fullyinsertedin theholder. Fig. 65 I5 when the sleeve is raised out of contact with G is a similar view showing the position of the base of the pillar the lower portion of the the parts when it is attempted to insert the pillar is exposed more or less. This construccondenser in the closed position of the upper tion is undesirable, because dust and gritare iris-diaphragm. Fig. '7 is a detached vertical liable to be deposited on the pillar and enter section of the upper iris-diaphragm and its 7o zo between the saine and the surrounding sleeve, casing, on au enlarged scale. Fig. S is a perand when this occurs the pillarand the sleeve spective View ol the condenser. Fig. 9 is an are cut by the grit and the sleeve is caused inverted perspective View of the condenserto bind on the pillar, thus interfering1 with holder and the upper iris-diaphragm and its the action of the tine adj nstment and rendershell detached from their supportingarm. 75 25 ing the same inaccurate. Like letters of reference refer to like parts One of the objects of my invention is to in the several figures. overcome these objections by providing the A is the base of the instrument; B, the instrument with a simple guard or protector standard rising from the saine; O, the lenswhich effectually excludes dust from the piltube; D, the vertically-movable sleeve which 8o 3o lar in all positions of the line adjustment. carries the lens-tube, and E the usual trian- In using a condenser with microscopes as gular or prisxnatic pillar on which the sleeve hitherto constructed the operatorsometimes slides. E is the enlarged base of the pillar, forgets to openthe upper iris-diaphragm bewhich is pivotally connected with the stand fore inserting the condenser in its holder, or ard B in a weltknown manner, and F is the 85 35 after having inserted the condenser attempts adj Listing-screw of the fineadjustme11t,wl1ere to close the diaphragm before removing the by the sleeve D is operated. These various condenser, and in either case the delicate parts are common and form no part of myinleaves of the diaphragm are liable to be vention. buckled or otherwise injured. G is a dust-cap, preferably of cylindrical 9o 4o It is a further object of my invention to form, which is secured to the lower end of the provide the instrument with a simple and insleeve D and which snulyoverlaps the cylinexpensive device which renders it impossible (li-ical base E' of the pillar. This cap is seto insert the condenser in its holder suiiicured to the sleeve by screws g, which pass ciently to come in contact with the upper through holes formed in the head of the cap 95 45 diaphragm-leaves when the latter are closed or by other suitable fasteuings, and the cap or to close the leaves while the condenser is is provided with a triangular opening for the in position for use, thus guarding against iupassage of the pillar, as shown in Eig. 3. jury to the diaphragm by a careless or irn- The cap moves up and down with the sleeve proper manipulation of these accessories. and is made ol' sufficient length to overlap the roo 5o In the accompanying drawings, Figure lis base ci the pillar when the sleeve is adjusted a fragmentary side elevation of a microscope to its uppermost position.

H isa ring orcollar which snugly surrounds the dust-cap G and which is secured at its lower end te the lower end of the pillar-base E',

preferably by a screw-thread, as shown at t in Fig. 2. The portion of the base E above the screw-threads is reduced to leave between the base and the collar H an annular space or socket h' ot sufficient width to admit the dust-cap G, as shown in Fig. 2. The collar H preferably extends a short distance above the base of the pillar. By this construction the dust-cap G overlaps the base of the pilla-1- and the collar H in turn overlaps the dustcap, thus forming a reliable dust-proof joint between the lower end of the sleeve and the pillar, insuring a smooth action ol the [ine adjustment and preserving` its accuracy.

I is the main stage, and i t" are upper and lower rings which form the casing or shell of the upper iris-diaphragm and which are secured together by a set-screw or other suitable means.

@"3 represents the pivoted leaves of the diaphragm,which are supportedon the upper ring c', and is the rotary operating-ring of the leaves, having the handle j. The leaves of this operating-ring may be constructed in any suitable or well-known manner. In the construction shown in the drawings the leaves are pivoted at one end to the supporting-ring vt', as shown at t, and are provided at their opposite ends with shifting-Linus t", which engage in radial notchesj?, formed in the rotary operating-ring, and the latter is provided at its upper end with an outwardly-extending liange js, which rests upon a liange 7s projecting inwardly from the upper end of the lower ring 'i' ot' the diaphragm-casing. This lower ring and the lower portion ot' the operatingring j are preferably conical and taper upwardly, and the opening or recess in the main stage I,which receives the upper diaphragmcasing, is made of corresponding form, as shown in Figs. 5 and (j.

L is the usual substage arm or support which carries the upper iris-diaphragm and which is made adjustable toward and from the main stage by any suitable or well-known adjusting device. ln the construction shown in the drawings this arm is operated by the well-known quick-screw adjustment L. The lower ring t" of the diaphragnrcasing is secured to the upper side of this arm by screws frt. The lower iris-diaphragm, which is arranged, as usual, in the lower portion ol the condenser, is not shown in the drawings.

N is the removable condenser, and N the upright ring or holder which receives the condenser and which is carried by the substage arm L. The upper portion ot' this holder is seated in an opening of said arm and pro- Vided with an outwardly-projecting flange n, which bears against the under side of the arm and is secured thereto by screws n.

0 is a guide pin or projection arranged on the lower portion of the condenser and interlocking with a notch o', formed in the lower edge oi' the holder i when the condenser is properly inserted therein, as shown in Fig. 5.

p is a stop-pin or projection arranged on the upper or conical portion of the condenser and adapted to enter an opening or recess p', formed in the operating-ring j of the upper iris-diaphragm. Vihen this ring is turned so as to bring said opening into register with said pin, as shown in Fig. 5, the condenser can be fully inserted in the holder; but when said opening is out of register with the stoppin the latter prevents the complete insertion of the condenser by striking the solid portion of the operating-ring. The opening ot' the operating-ring is so arranged relatively to the stop-pin p of the condenser that when the diaphragm is open and the condenser is inserted in its holder with its lower guide-pin o in line with the notch o ot' the holder the opening of 'l he operating-ring coincides with the stop-pin of the condenser and permits the latter to be slid upward into its normal position without restraint, while when the diaphragm is closed the opening of the operating-ring breaks register with the stop-pin of the condenser, so that said pin arrests the upward movement of the condenser before the same comes in contact with the closed diaphragm, as shown in Fig. (5. By providing this sr't'feguard it is impossible to properly insert the condenser in its holder without Ylirst opening the upper diaphragm in case the same is closed, and it is also impossible to close the diaphragm before removing the condenser, because when the condenser is in place its stop-pin p projects into the opening of the operating-ring and locks the latter against turning. Buckling or other injury to the diaphragni-leaves by a careless or improper handling of the accessories is therefore cllectually prevented.

As shown in Figs. 5, G, and 7, the lower ring t" ol the diaphragm-casing is separated from the operating-ring,yY to )ermit the complete insertion of the condenser before its stop-pin p connes in contact with said ring.

l claim as my inventionl. ln a microscope or similarinstru ment, the combination with the pillar, its base, and the adjustable sleeve sliding on the pillar and carrying the lens-tube, of a collar surrounding said base and secured at its lower end to the same and having its remaining portion separated therefrom by an intervening space `lorining a socket, and a dust-cap secured to the lower end oi the sleeve and iitting into the space or socket between the pillar-base and said collar, substantially as set forth.

2. The eombin ation with an iris-diaphragm, its support, its rotary operating ring, a condenser-holder arranged below said diaphragm, and a condenser adapted to be insei-ted into said holder from below, of guide devices on the condenser and its holder which control the position ol' the condenser in its holder circumfercntially, and stop devices on the condenser and the rotary ring of the irisdiaphragm which permit the full insertion of IOO the Condenser into its holder only when the diaphragm is open, substantially as set forth.

3. The combination with an irisdiaphragm, its support, its rotary operatingring provided with an opening or recess, a condenserholder arranged below said diaphragm, and a condenser adapted to be inserted into said holder from below, of guide devices on the condenser and its holder which control the position of the condenser in its holder eireumferentially and a stop on the condenser which strikes the operating-ring of the diaphragm and prevents the insertion of the condenser into the holder when the diaphragm is Closed and which enters the opening or recess in said ring and permits the insertion of the Condenser when the diaphragm is open, substantially as set forth.

4. The combination with an iris-diaphragm HERMANN ZIRN GIBL.

Witnesses CARL F. GEYER, CLAUDIA M. BENTLEY. 

